import java.util.HashSet;
import java.util.Scanner;
import java.util.Set;
// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNextLine()) { // 注意 while 处理多个 case
            String str1 = in.nextLine();
            String str2 = in.nextLine();
            func(str1,str2);
        }
    }
    public static void func(String str1,String str2){
        str1 = str1.toUpperCase();
        str2 = str2.toUpperCase();
        Set<Character> set = new HashSet<>();
        //存按键
        for (int i = 0; i < str2.length(); i++) {
            char ch = str2.charAt(i);
            set.add(ch);
        }
        //判断
        Set<Character> contain = new HashSet<>();
        for (int i = 0; i < str1.length(); i++) {
            char ch1 = str1.charAt(i);
            if(!set.contains(ch1) && !contain.contains(ch1)){
                contain.add(ch1);
                System.out.print(ch1);
            }
        }
    }
}